Attack speed reduction is extremely strong against Irelia, which lessens the effectiveness of her Hiten Style's active.
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1151

Be wary of having higher health than she does, as her Equilibrium Strike will stun you instead of slowing you.
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1109

Be wary of being near low-health minions as she can dash on them to get closer to you. Report

540

If you know her animation for her hiten style, you can time it for 5 seconds and engage while its down, for it no longer does true damage but only do so if you can kill her and are tanky enough for it.Report